6
Terminal Designator Descriptions
A – Alarm
C – 24 VAC common
DH – Dehumidification
G – Low speed fan
G2 – High speed fan
RC, RH – 24 VAC hot
SC, S1 – Remote sensor or outdoor sensor
W1 – 1st stage heat
W2 – 2nd stage heat
W3 – 3rd stage heat
Y1 – 1st stage cool
Y2 – 2nd stage cool
Y3 – 3rd stage cool
Note 1:
Not all terminals are used
in every model.
Note 2:
A connection to 24VAC
common (C) is required.
G
DH
W3 W2 W1 Y3 Y2 Y1
C
RC RH
A
SC S1
G
DH
W3 W2 W1 Y3 Y2 Y1
C
RC RH
A
SC S1
I/O Exp
TB1-1
Remote
Sensor
Microtech III unit controller TB2
Thermostat
